Related Clues:
- Major period of history
- Nearly infinite perioD
- A gazillion years, seemingly
- Seemingly endless time
- Many a doctor's office wait, seemingly
- Billion-year span
- Twenty bajillion years
- Looking back, he boxed officer some time ago perhaps
- Looking back, he boxed officer at the start of a new dawn
- Millions of lifetimes
- Particular period in time
- Great geological time span
- Pleistocene, e.g
- Geological age
- Quasi-opposite of ''flash''